### The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class.

A. 47.55 kgs B. 48 kgs C. 48.55 kgs D. 49.25 kgs Answer: Option C

### Solution(By Apex Team)

\begin{aligned}&\text{ Required mean }\\ &=\left(\frac{50.25\times16+45.15\times8}{16+8}\right)\\ &=\left(\frac{804+361.20}{24}\right)\\ &=\frac{1165.20}{24}\\ &=48.55\end{aligned}

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years